28901649 has 32 divisors (see below), whose sum is σ = 47312640. Its totient is φ = 15316992.

The previous prime is 28901647. The next prime is 28901651. The reversal of 28901649 is 94610982.

It is an interprime number because it is at equal distance from previous prime (28901647) and next prime (28901651).

It is not a de Polignac number, because 28901649 - 2¹ = 28901647 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28901647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25507 + ... + 26615.

It is an arithmetic number, because the mean of its divisors is an integer number (1478520).

Almost surely, 2^28901649 is an apocalyptic number.

It is an amenable number.

28901649 is a deficient number, since it is larger than the sum of its proper divisors (18410991).

28901649 is a wasteful number, since it uses less digits than its factorization.

28901649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 28901649 is about 5376.0253905650. The cubic root of 28901649 is about 306.8839726071.

The spelling of 28901649 in words is "twenty-eight million, nine hundred one thousand, six hundred forty-nine".